Question

What does a gamma distribution look like?

Answer 1

In probability theory and statistics, the gamma distribution is a two-parameter family of continuous probability distributions. The exponential distribution, Erlang distribution, and chi-squared distribution are special cases of the gamma distribution. There are three different parametrizations in common use:

With a shape parameter k and a scale parameter θ.

With a shape parameter α = k and an inverse scale parameter β = 1/θ, called a rate parameter.

With a shape parameter k and a mean parameter μ = k/β.